Head-to-head · A/B Testing Tools
Optimizely Experimentation vs Harness Feature Management & Experimentation
Optimizely Experimentation leads on 0 checks, Harness Feature Management & Experimentation on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreOptimizely Experimentation · 9.3/10
- Free planonly Optimizely Experimentation
- Most featuresOptimizely Experimentation · 5 of 5
Optimizely Experimentation scores higher on our rubric for a/b testing tools: 9.3 against 7.7 out of 10; our editors rank them #1 and #16.
Optimizely Experimentation is the better fit for mature organizations running complex experiments. Harness Feature Management & Experimentation is the better fit for teams combining feature flags and experimentation.
- Optimizely Experimentation fits best
Mature organizations running complex experiments
- Harness Feature Management & Experimentation fits best
Teams combining feature flags and experimentation
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Side by side
| Feature | Optimizely Experimentation 9.3/10 Visit ↗ | Harness Feature Management & Experimentation 7.7/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 9.3 | 7.7 |
| Ranking | #1 in A/B Testing Tools | #16 in A/B Testing Tools |
| Best for | Mature organizations running complex experiments | Teams combining feature flags and experimentation |
| Pricing model | Free plan + paid | Paid |
| Starting price | — | Pricing on request |
| Free plan | ✓ (best) | Not checked yet |
| Free trial | — | — |
| Deployment | Cloud | Cloud |
| Platforms | Web, iOS, Android | Web, iOS, Android |
| Support | Tickets, Community, Docs | Email, Tickets, Community, Docs · 24/7 |
| Compliance | SOC 2, ISO 27001, GDPR, HIPAA, PCI DSS | SOC 2, ISO 27001, GDPR, SSO/SAML, 2FA |
| Integrations | 3 integrations | 12 integrations |
| Built for | Small business, Mid-market, Enterprise | Mid-market, Enterprise |
| Features Optimizely Experimentation 5/5 · Harness Feature Management & Experimentation 4/5 | ||
| Visual editor | ✓ (best) | Not checked yet |
| Server-side testing | ✓ | ✓ |
| Mobile SDK | ✓ | ✓ |
| Audience targeting | ✓ | ✓ |
| Feature flags | ✓ | ✓ |
| Specs | ||
| Test types | A/B testing, multi-page testing, feature testing, server-side testing, multivariate testing, multi-armed bandit testing | A/B testing; sequential testing; fixed-horizon testing; warehouse-native experimentation |
| Supported platforms | Web_and_mobile | Web_and_mobile |
| Our review | ||
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| Cons |
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| Our verdict | Optimizely Experimentation is designed for marketing, product, and engineering teams running experiments across websites, mobile applications, APIs, and other connected digital channels. It covers client-side web testing through a… Read the review → |
Harness Feature Management & Experimentation combines feature flags, progressive rollouts, runtime configuration, release monitoring, and experimentation in one platform. It is designed for engineering, product, and data teams running… Read the review → |
Strengths and trade-offs
Optimizely Experimentation — where it wins
- Supports web, mobile, API, and server-side experimentation
- Combines visual testing, feature flags, targeting, and personalization
- Includes multivariate, funnel, redirect, and bandit testing options
Where it doesn't
- Pricing requires contacting sales for an individually packaged plan
- SDK-based server-side testing may require engineering involvement
- Its broad feature set may exceed the needs of simple web-test teams
Harness Feature Management & Experimentation — where it wins
- Free plan with feature flags and cloud experimentation
- Warehouse-native, sequential, and fixed-horizon testing
- Web, backend, Android, and iOS SDK coverage
Where it doesn't
- Paid pricing requires contacting sales
- No visual editor for experiment creation
- Governance features may exceed simple testing needs
- Optimizely Experimentation9.3/10 · Free plan
A broad experimentation suite for mature teams running complex digital tests.
Visit OptimizelyFull verdict → - Harness Feature Management & Experimentation7.7/10 · Pricing on request
A broad experimentation platform for teams that also need feature flags and governance.
Visit HarnessFull verdict →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update